Question

A constant force of 5N acts for 5seconds on a mass of 5Kg initially at rest.clculate the final momentum

Answer 1

we know that Force is mass times acceleration F=ma 
so plugging in what we know 
F= 5 N 
m=5kg 
and solving for acceleration 

5N = 5kg (a) m/s^2 
a = 1 m/s^2 

velocity is acceleration times time (a)t 

v = 1 m/s^2 (5 s) = 5 m/s 

thus final momentum = mv 
p = 5 kg 5 m/s = 25 kg m/s